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Boron group
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<table><tbody><tr><th colspan="2">↓ <a href="/facts/Period_(periodic_table)/WpGUFh5V">Period</a></th></tr><tr><th><a href="/facts/Period_2_element/1ajRWfrb">2</a></th><td><a href="/facts/Boron/Pmwgd7Mf">Boron</a> (B)5 <a href="/facts/Metalloid/uMFVXuTq">Metalloid</a></td></tr><tr><th><a href="/facts/Period_3_element/1BE0Nc0K">3</a></th><td><a href="/facts/Aluminium/7wmR8jYE">Aluminium</a> (Al)13 <a href="/facts/Other_metal/wjp3aeGn">Other metal</a></td></tr><tr><th><a href="/facts/Period_4_element/BgDFfE26">4</a></th><td><a href="/facts/Gallium/EucevDs9">Gallium</a> (Ga)31 <a href="/facts/Other_metal/wjp3aeGn">Other metal</a></td></tr><tr><th><a href="/facts/Period_5_element/xLJUWWDS">5</a></th><td><a href="/facts/Indium/zRq3stVb">Indium</a> (In)49 <a href="/facts/Other_metal/wjp3aeGn">Other metal</a></td></tr><tr><th><a href="/facts/Period_6_element/9YleCXwf">6</a></th><td><a href="/facts/Thallium/v35pGMJB">Thallium</a> (Tl)81 <a href="/facts/Other_metal/wjp3aeGn">Other metal</a></td></tr><tr><th><a href="/facts/Period_7_element/H5QuVHGQ">7</a></th><td><a href="/facts/Nihonium/sb09p5dv">Nihonium</a> (Nh)113 other metal</td></tr><tr><td colspan="2"><p><i>Legend</i></p><table><tbody><tr><td><a href="/facts/Primordial_element/lFAUqHDv">primordial element</a></td></tr><tr><td><a href="/facts/Synthetic_element/azU9Nr1m">synthetic element</a></td></tr></tbody></table></td></tr></tbody></table> <p>The boron group are the <a href="/facts/Chemical_element/0jducgWD">chemical elements</a> in <a href="/facts/Periodic_table_group/YGBcUabv">group 13</a> of the <a href="/facts/Periodic_table/umdGIfUb">periodic table</a>, consisting of <a href="/facts/Boron/Pmwgd7Mf">boron</a> (B), <a href="/facts/Aluminium/7wmR8jYE">aluminium</a> (Al), <a href="/facts/Gallium/EucevDs9">gallium</a> (Ga), <a href="/facts/Indium/zRq3stVb">indium</a> (In), <a href="/facts/Thallium/v35pGMJB">thallium</a> (Tl) and <a href="/facts/Nihonium/sb09p5dv">nihonium</a> (Nh). This group lies in the <a href="/facts/P-block/BbzD5jUU">p-block</a> of the periodic table. The elements in the boron group are characterized by having three <a href="/facts/Valence_electron/mXPA15VP">valence electrons</a>. These elements have also been referred to as the triels. </p><p>Several group 13 elements have biological roles in the <a href="/facts/Ecosystem/kVE8mSmR">ecosystem</a>. Boron is a trace element in humans and is essential for some plants. Lack of boron can lead to stunted plant growth, while an excess can also cause harm by inhibiting growth. Aluminium has neither a biological role nor significant toxicity and is considered safe. Indium and gallium can stimulate metabolism; gallium is credited with the ability to bind itself to iron proteins. Thallium is highly toxic, interfering with the function of numerous vital enzymes, and has seen use as a <a href="/facts/Pesticide/Uhf4KnwJ">pesticide</a>. </p>